EP0133523B1 - Lengthwise adjustable gas spring for a lockable lifting device for the infinitely variable positioning of seats, table tops or the like - Google Patents

Lengthwise adjustable gas spring for a lockable lifting device for the infinitely variable positioning of seats, table tops or the like Download PDF

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Publication number
EP0133523B1
EP0133523B1 EP84108989A EP84108989A EP0133523B1 EP 0133523 B1 EP0133523 B1 EP 0133523B1 EP 84108989 A EP84108989 A EP 84108989A EP 84108989 A EP84108989 A EP 84108989A EP 0133523 B1 EP0133523 B1 EP 0133523B1
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EP
European Patent Office
Prior art keywords
fixing portion
sliding member
push rod
coaxially
guide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP84108989A
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German (de)
French (fr)
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EP0133523A2 (en
EP0133523A3 (en
Inventor
Hans Jürgen Bauer
Hans-Peter Bauer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Fritz Bauer and Sohne OHG
Original Assignee
Fritz Bauer and Sohne OHG
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Publication date
Application filed by Fritz Bauer and Sohne OHG filed Critical Fritz Bauer and Sohne OHG
Priority to AT84108989T priority Critical patent/ATE33538T1/en
Publication of EP0133523A2 publication Critical patent/EP0133523A2/en
Publication of EP0133523A3 publication Critical patent/EP0133523A3/en
Application granted granted Critical
Publication of EP0133523B1 publication Critical patent/EP0133523B1/en
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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47C—CHAIRS; SOFAS; BEDS
    • A47C3/00—Chairs characterised by structural features; Chairs or stools with rotatable or vertically-adjustable seats
    • A47C3/20—Chairs or stools with vertically-adjustable seats
    • A47C3/30—Chairs or stools with vertically-adjustable seats with vertically-acting fluid cylinder

Definitions

  • the invention relates to a length-adjustable gas spring according to the preamble of claim 1.
  • Such a length-adjustable gas spring is known from DE-U-7 019 918, the sliding body of which is designed as a pin which is displaceably arranged in a corresponding guide in the generally conical fastening section.
  • it has already become known to produce such sliding bodies entirely from plastic and to arrange them so that they can move in the fastening section without additional guides.
  • It has also become known here, see e.g. CH-A-619604 to screw a coaxial screw into this sliding body from the outside, the head of which forms an outer surface against which an actuating lever for actuating the actuating plunger of the gas spring rests. Due to the adjustability of the screw in the axial direction of the gas spring, the play between the outer surface and the actuating lever can be avoided. The axial adjustment of this screw is tedious.
  • the invention has for its object to develop the generic gas spring so that a simple adjustment of the outer surface of the sliding body in the axial direction is possible.
  • Claim 2 represents a particularly advantageous embodiment of the sliding body.
  • the measures according to claim 3 ensure that, despite the normally conical inner surface of the fastening section, a rotation-free guidance is ensured over the full sliding path of the sliding body, so that no jams can occur between the sliding body and the fastening section.
  • the sliding body is secured against falling out, in particular during transport.
  • the blockable lifting device shown in the drawing for the stepless adjustment of seats or table tops has a lower guide tube 1, which is essentially cylindrical, but in its lower region has a downwardly conically tapering section 2, which is received in a corresponding hub 3 of a base 4 serves.
  • the guide tube 1 is provided near its lower end with a base plate 5 which has an opening 7 which is concentric with the central longitudinal axis 6 of the entire lifting device and thus also the guide tube 1.
  • a length-adjustable, hydraulically or pneumatically lockable gas spring 8 the cylindrical housing of which is located in the upper region of the guide tube 1 and protrudes upwards from it, while its piston rod 10 projects downwards from the housing 9 and with the Base plate 5 is detachably connected.
  • the free end of the piston rod 10 is formed with a reduced-diameter pin 11, on which an axial ball bearing 12 is arranged, the upper race 13 of which is supported against the collar 14 formed at the transition between the pin 11 and the piston rod 10, while the lower race 15 is supported against the base plate 5.
  • a locking ring 16 is attached to the pin, which holds the axial ball bearing 12 in the position shown, even if the lower race 15 is not supported against the base plate 5.
  • the pin 11 passes through the opening 7 with a sufficient radial play of a few tenths to a millimeter, so that the piston rod 10 is not radially clamped relative to the guide tube 1.
  • a washer 17 is pushed onto the pin 11, the diameter of which is larger than the diameter of the opening 7.
  • a securing element 18 is pushed, so that the piston rod 10 of the gas spring 8 is axially fixed but detachable with the guide tube 1 is connected.
  • the continuous circular cylindrical housing 9 of the gas spring 8 is arranged in a tube 20 with a sliding fit, which is also circular cylindrical over its essential length, ie the radial play between the housing 9 and the tube 20 is a few hundredths to a maximum of 1 or 2 tenths of a millimeter.
  • the game is just that the housing 9 of the gas spring 8 in the tube 20th can be inserted or pulled out of this, but at the same time the housing 9 is guided and held radially in the tube 20.
  • This tube 20 which forms a detachable part of the gas spring 8, is provided in its upper region, projecting beyond the housing 9, with a conically tapering fastening section 21, which is used to produce a firm, easy-to-produce plug connection with a correspondingly designed hub 22, which is on the underside a chair, armchair, table top or the like is attached.
  • a sleeve 23 is arranged in the tube 20 in accordance with the tapering of the tube 20, which sleeve is thus axially fixed in the direction of the fastening section 21.
  • the housing 9 of the gas spring 8 is supported axially firmly against this sleeve 23.
  • the housing 9 is held axially in the tube 20 by means of a releasable fastening element 24.
  • This can be a so-called claw, i.e. a ring provided with resilient projections, which can be relatively easily pushed into the tube 20 in one direction, that is to say, against the housing 9, but opposes an opposite movement in that he grips the pipe like a barb.
  • a screwdriver With sufficient effort, for example by means of a screwdriver, it can be easily removed downwards, as a result of which the connection between the housing 9 and the tube 20 is broken in a simple manner.
  • fasteners including screw connections, can also be used.
  • This tube which forms a detachable part of the gas spring 8 is mounted in the usual manner axially displaceably in the guide tube 1, for which purpose this is provided in its upper region with a guide bush 25 made of a suitable plastic.
  • the guide tube 1 and the tube 20 are made of steel.
  • the sleeve 23 consists of a softer material, for example die-cast zinc.
  • Length adjustments of the gas spring 8 and thus height adjustments of the entire lifting device are carried out by actuating an actuating plunger 26 of the gas spring 8 which protrudes from the upper end facing away from the piston rod 10 and which is pressed into the housing 9 to enable the corresponding length adjustments.
  • an upwardly protruding sliding body 27 is arranged in the fastening section 21, which tapers conically upwards and bears with a contact surface 28 against the actuating push piece 26.
  • This sliding body 27 is further provided with retaining fingers 29 which engage resiliently behind a corresponding ring 30 on the sleeve 23, as a result of which the sliding body 27 is secured against the actuating plunger 26 against inadvertent falling out or pulling out of the fastening section 21 while at the same time the bearing surface 28 is largely free of play is.
  • the holding fingers 29 of the sliding body 27 can of course slide freely along the inner surface of the sleeve 23.
  • the actuation takes place by means of a pivotable actuation lever 35 which is mounted in the hub 22 in the usual way and which comes to bear against an axially adjustable outer surface 36 of the sliding body 27.
  • This outer surface 36 is formed by the head of a screw 31 which is screwed into a corresponding coaxial recess 32 in the sliding body 27.
  • the screw 31 and the recess 32 are dimensioned such that the screw 31 provided with a wood screw thread is held in the plastic of the sliding body 27 in a self-locking manner.
  • the screw 31 is screwed into the sliding body 27 in such a way that its outer surface 36 lies against the actuating lever 35 without play, so that it does not have any play noticeable to a user.
  • the sliding body 27 is non-rotatably arranged in the fastening section 21.
  • an upper sleeve-like guide section 33 which bears against the inner wall of the fastening section 21, is designed as a polygon cross section, for example as an octagonal cross section, as can be seen from FIG. 2.
  • the surface lines of this guide section 33 run parallel to one another.
  • the inner wall of the fastening section 21 is designed as an octagonal guide surface 34, which is dimensioned such that the guide section 33 can slide along it without jamming but secured against rotation.
  • the guide surface 34 thus extends downward beyond the guide section 33 by the amount by which the actuating plunger 26 can be inserted into the housing 9.

Landscapes

  • Fluid-Damping Devices (AREA)
  • Tables And Desks Characterized By Structural Shape (AREA)
  • Chairs Characterized By Structure (AREA)
  • Vehicle Body Suspensions (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)

Abstract

1. Longitudinally displaceable pneumatic spring for a lockable lifting device for the infinitely variable adjustment of seats, table tops or the like, with an at least predominantly cylindrical housing from one end of which project coaxially a piston rod (10) and from its other end coaxially an actuating push rod (26) for longitudinal adjustment purposes, with, extending the housing (9) coaxially and enclosing the actuating push rod (26), a fixing portion for attachment to a hub provided on the seat or on the table top and with, disposed for displacement in the fixing portion (21) and adapted to abut the actuating push rod (26), a sliding member (27) comprising an axially screw-adjustable outer surface for substantially clearance free abutment on an actuating lever (35), characterised in that the sliding member (27) is non-rotatably guided in the fixing portion (21), for which purpose the sliding member (27) has, bearing on a guide face (34) of the fixing portion (21), a guide portion (33) of non-circular cross-section.

Description

Die Erfindung betrifft eine längenverstellbare Gasfeder nach dem Oberbegriff des Anspruches 1.The invention relates to a length-adjustable gas spring according to the preamble of claim 1.

Aus dem DE-U-7 019 918 ist eine solche längenverstellbare Gasfeder bekannt, deren Schiebekörper als Stift ausgebildet ist, der in einer entsprechenden Führung in dem in der Regel konischen Befestigungsabschnitt verschiebbar angeordnet ist. In der Praxis ist es bereits bekanntgeworden, solche Schiebekörper insgesamt aus Kunststoff herzustellen und ohne zusätzliche Führungen in dem Befestigungsabschnitt verschiebbar anzuordnen. Es ist hierbei weiterhin bereits bekanntgeworden siehe z.B. CH-A-619604, in diese Schiebekörper koaxial von aussen eine Schraube hineinzuschrauben, deren Kopf eine Aussenfläche bildet, gegen die ein Betätigungshebel zur Betätigung des Betätigungsstössels der Gasfeder anliegt. Durch die Verstellbarkeit der Schraube in Achsrichtung der Gasfeder kann das Spiel zwischen der Aussenfläche und dem Betätigungshebel vermieden werden. Die axiale Einstellung dieser Schraube ist aber mühsam.Such a length-adjustable gas spring is known from DE-U-7 019 918, the sliding body of which is designed as a pin which is displaceably arranged in a corresponding guide in the generally conical fastening section. In practice, it has already become known to produce such sliding bodies entirely from plastic and to arrange them so that they can move in the fastening section without additional guides. It has also become known here, see e.g. CH-A-619604 to screw a coaxial screw into this sliding body from the outside, the head of which forms an outer surface against which an actuating lever for actuating the actuating plunger of the gas spring rests. Due to the adjustability of the screw in the axial direction of the gas spring, the play between the outer surface and the actuating lever can be avoided. The axial adjustment of this screw is tedious.

Aus diesem Grunde liegt der Erfindung die Aufgabe zugrunde, die gattungsgemässe Gasfeder so weiterzubilden, dass ein einfaches Einstellen der Aussenfläche des Schiebekörpers in Achsrichtung möglich ist.For this reason, the invention has for its object to develop the generic gas spring so that a simple adjustment of the outer surface of the sliding body in the axial direction is possible.

Diese Aufgabe wird erfindungsgemäss durch die Merkmale des Kennzeichnungsteiles des Anspruches 1 gelöst. Dadurch, dass der Schiebekörper gegenüber dem Befestigungsabschnitt und damit gegenüber der Gasfeder undrehbar ist, kann in sehr einfacher Weise eine axiale Einstellung der Aussenfläche erfolgen. Die Spielfreiheit zwischen Schiebekörper und Betätigungshebel ist also leicht einstellbar. Dadurch, dass einerseits der Schiebekörper einen unrunden Querschnitt hat und andererseits der Schiebekörper an einer Führungsfläche des Befestigungsabschnittes anliegt, die also einen entsprechenden unrunden Querschnitt aufweist, ist hinausgehend über die Verdrehsicherung eine einwandfreie Führung in Achsrichtung sichergestellt und auch eine besonders leichte Montage des Schiebekörpers ermöglicht.This object is achieved according to the invention by the features of the characterizing part of claim 1. Because the sliding body is non-rotatable with respect to the fastening section and thus with respect to the gas spring, an axial adjustment of the outer surface can be carried out in a very simple manner. The backlash between the sliding body and the operating lever is therefore easily adjustable. Because on the one hand the sliding body has a non-circular cross-section and on the other hand the sliding body rests on a guide surface of the fastening section, which therefore has a corresponding non-circular cross-section, proper guiding in the axial direction is ensured in addition to the anti-rotation device and also enables particularly easy assembly of the sliding body.

Anspruch 2 gibt eine besonders vorteilhafte Ausgestaltung des Schiebekörpers wieder. Durch die Massnahmen nach Anspruch 3 ist sichergestellt, dass trotz der normalerweise konischen Innenfläche des Befestigungsabschnittes über den vollen Schiebeweg des Schiebekörpers eine verdrehungsfreie Führung gesichert ist, so dass keine Klemmungen zwischen Schiebekörper und Befestigungsabschnitt eintreten können. Hierbei ist es wiederum von Vorteil, wenn gemäss Anspruch 4 der Schiebekörper gegen ein Herausfallen, insbesondere beim Transport, gesichert ist.Claim 2 represents a particularly advantageous embodiment of the sliding body. The measures according to claim 3 ensure that, despite the normally conical inner surface of the fastening section, a rotation-free guidance is ensured over the full sliding path of the sliding body, so that no jams can occur between the sliding body and the fastening section. Here again, it is advantageous if, according to claim 4, the sliding body is secured against falling out, in particular during transport.

Weitere Vorteile der Erfindung ergeben sich aus der Beschreibung eines Ausführungsbeispieles anhand der Zeichnung. Es zeigt

  • Fig. eine blockierbare Hubvorrichtung mit einer längenverstellbaren Gasfeder nach der Erfindung in einer Längsansicht, in teilweise aufgeschnittener Darstellung und
  • Fig. 2 einen Schnitt gemäss der Schnittlinie 11-11 in Fig. 1.
Further advantages of the invention result from the description of an embodiment with reference to the drawing. It shows
  • Fig. A blockable lifting device with a length-adjustable gas spring according to the invention in a longitudinal view, in a partially cutaway view
  • 2 shows a section along section line 11-11 in FIG. 1.

Die in der Zeichnung dargestellte blockierbare Hubvorrichtung zum stufenlosen Verstellen von Sitzen oder Tischplatten weist ein unteres Führungsrohr 1 auf, das im wesentlichen zylindrisch ausgebildet ist, in seinem unteren Bereich aber einen sich nach unten konisch verjüngenden Abschnitt 2 aufweist, der zur Aufnahme in einer entsprechenden Nabe 3 eines Fussgestells 4 dient. Das Führungsrohr 1 ist in der Nähe seines unteren Endes mit einer Bodenplatte 5 versehen, die eine zur Mittel-Längsachse 6 der gesamten Hubvorrichtung und damit auch des Führungsrohres 1 konzentrische Öffnung 7 aufweist. Ebenfalls achsparallel mit der Längsachse 6 ist eine längenverstellbare, hydraulisch oder pneumatisch blokkierbare Gasfeder 8 vorgesehen, deren zylindrisches Gehäuse sich im oberen Bereich des Führungsrohres 1 und aus diesem nach oben hinausragend befindet, während ihre Kolbenstange 10 nach unten aus dem Gehäuse 9 herausragt und mit der Bodenplatte 5 lösbar verbunden ist. Hierzu ist das freie Ende der Kolbenstange 10 mit einem im Durchmesser reduzierten Zapfen 11 ausgebildet, auf dem ein Axial-Kugel-Lager 12 angeordnet ist, dessen oberer Laufring 13 sich gegen den am Übergang zwischen Zapfen 11 und Kolbenstange 10 ausgebildeten Ringbund 14 abstützt, während der untere Laufring 15 sich gegen die Bodenplatte 5 abstützt. Ausserdem ist auf dem Zapfen ein Sicherungsring 16. angebracht, der das Axial-Kugel-Lager 12 in der dargestellten Stellung hält, auch wenn der untere Laufring 15 sich nicht gegen die Bodenplatte 5 abstützt.The blockable lifting device shown in the drawing for the stepless adjustment of seats or table tops has a lower guide tube 1, which is essentially cylindrical, but in its lower region has a downwardly conically tapering section 2, which is received in a corresponding hub 3 of a base 4 serves. The guide tube 1 is provided near its lower end with a base plate 5 which has an opening 7 which is concentric with the central longitudinal axis 6 of the entire lifting device and thus also the guide tube 1. Also axially parallel to the longitudinal axis 6 is a length-adjustable, hydraulically or pneumatically lockable gas spring 8, the cylindrical housing of which is located in the upper region of the guide tube 1 and protrudes upwards from it, while its piston rod 10 projects downwards from the housing 9 and with the Base plate 5 is detachably connected. For this purpose, the free end of the piston rod 10 is formed with a reduced-diameter pin 11, on which an axial ball bearing 12 is arranged, the upper race 13 of which is supported against the collar 14 formed at the transition between the pin 11 and the piston rod 10, while the lower race 15 is supported against the base plate 5. In addition, a locking ring 16 is attached to the pin, which holds the axial ball bearing 12 in the position shown, even if the lower race 15 is not supported against the base plate 5.

Der Zapfen 11 durchsetzt die Öffnung 7 mit einem ausreichenden radialen Spiel von einigen Zehnteln bis zu einem Millimeter, so dass die Kolbenstange 10 gegenüber dem Führungsrohr 1 nicht radial verspannt wird. Von aussen, also unten, ist auf den Zapfen 11 eine Beilagscheibe 17 aufgeschoben, deren Durchmesser grösser ist als der Durchmesser der Öffnung 7. Hiergegen ist wiederum ein Sicherungselement 18 geschoben, so dass die Kolbenstange 10 der Gasfeder 8 axial fest aber lösbar mit dem Führungsrohr 1 verbunden ist. Auf der Kolbenstange 10 befindet sich ein etwa ringzylindrischer Endlagen- oder Anschlag-Dämpfer 19 aus Gummi, der mit seiner Unterseite gegen den oberen Laufring 13 des Axial-KugelLagers 12 anliegt.The pin 11 passes through the opening 7 with a sufficient radial play of a few tenths to a millimeter, so that the piston rod 10 is not radially clamped relative to the guide tube 1. From the outside, i.e. below, a washer 17 is pushed onto the pin 11, the diameter of which is larger than the diameter of the opening 7. Against this, a securing element 18 is pushed, so that the piston rod 10 of the gas spring 8 is axially fixed but detachable with the guide tube 1 is connected. On the piston rod 10 there is an approximately ring-cylindrical end position or stop damper 19 made of rubber, which rests with its underside against the upper race 13 of the axial ball bearing 12.

Das durchgehend kreiszylindrische Gehäuse 9 der Gasfeder 8 ist in einem über seine wesentliche Länge ebenfalls kreiszylindrischen Rohr 20 mit Schiebesitz angeordnet, d.h. das radiale Spiel zwischen dem Gehäuse 9 und dem Rohr 20 beträgt einige Hundertstel bis maximal 1 oder 2 Zehntel Millimeter. Das Spiel ist also gerade so, dass das Gehäuse 9 der Gasfeder 8 in das Rohr 20 eingeschoben bzw. aus diesem herausgezogen werden kann, wobei gleichzeitig aber das Gehäuse 9 in dem Rohr 20 radial geführt und gehalten ist. Dieses einen lösbaren Teil der Gasfeder 8 bildende Rohr 20 ist in seinem oberen, das Gehäuse 9 überragenden Bereich mit einem sich konisch verjüngenden Befestigungsabschnitt 21 versehen, der zur Herstellung einer festen, einfach herzustellenden Steckverbindung mit einer entsprechend ausgebildeten Nabe 22 dient, die an der Unterseite eines Stuhles, Sessels, einer Tischplatte oder dergleichen befestigt ist. Am Übergang zu dem Befestigungsabschnitt 21 ist im Rohr 20 eine entsprechend der Verjüngung des Rohres 20 ausgebildete Hülse 23 angeordnet, die also in Richtung auf den Befestigungsabschnitt 21 axial festliegt. Gegen diese Hülse 23 stützt sich das Gehäuse 9 der Gasfeder 8 axial fest ab.The continuous circular cylindrical housing 9 of the gas spring 8 is arranged in a tube 20 with a sliding fit, which is also circular cylindrical over its essential length, ie the radial play between the housing 9 and the tube 20 is a few hundredths to a maximum of 1 or 2 tenths of a millimeter. The game is just that the housing 9 of the gas spring 8 in the tube 20th can be inserted or pulled out of this, but at the same time the housing 9 is guided and held radially in the tube 20. This tube 20, which forms a detachable part of the gas spring 8, is provided in its upper region, projecting beyond the housing 9, with a conically tapering fastening section 21, which is used to produce a firm, easy-to-produce plug connection with a correspondingly designed hub 22, which is on the underside a chair, armchair, table top or the like is attached. At the transition to the fastening section 21, a sleeve 23 is arranged in the tube 20 in accordance with the tapering of the tube 20, which sleeve is thus axially fixed in the direction of the fastening section 21. The housing 9 of the gas spring 8 is supported axially firmly against this sleeve 23.

Von der anderen Seite her, also vom unteren freien Ende des Rohres 20 her ist das Gehäuse 9 in dem Rohr 20 axial mittels eines lösbaren Befestigungselementes 24 festgehalten. Hierbei kann es sich um eine sogenannte Kralle handeln, also einen mit federnden Vorsprüngen versehenen Ring, der sich in einer Richtung, also bis zur Anlage gegen das Gehäuse 9 relativ leicht in das Rohr 20 einschieben lässt, sich aber einer entgegengesetzten Bewegung dadurch widersetzt, dass er sich widerhakenartig in dem Rohr verklammert. Mit einem ausreichenden Kraftaufwand, beispielsweise mittels eines Schraubendrehers, ist er aber ohne weiteres nach unten harausnehmbar, wodurch in einfacher Weise die Verbindung zwischen dem Gehäuse 9 und dem Rohr 20 aufgehoben wird. Naturgemäss kommen auch viele andere Arten von Befestigungselementen einschliesslich Schraubenverbindungen in Betracht.From the other side, ie from the lower free end of the tube 20, the housing 9 is held axially in the tube 20 by means of a releasable fastening element 24. This can be a so-called claw, i.e. a ring provided with resilient projections, which can be relatively easily pushed into the tube 20 in one direction, that is to say, against the housing 9, but opposes an opposite movement in that he grips the pipe like a barb. With sufficient effort, for example by means of a screwdriver, it can be easily removed downwards, as a result of which the connection between the housing 9 and the tube 20 is broken in a simple manner. Naturally, many other types of fasteners, including screw connections, can also be used.

Dieses einen lösbaren Teil der Gasfeder 8 bildende Rohr ist in üblicher Weise axial verschiebbar in dem Führungsrohr 1 gelagert, wozu dieses in seinem oberen Bereich mit einer Führungsbüchse 25 aus einem geeignetem Kunststoff versehen ist. Demgegenüber bestehen das Führungsrohr 1 und das Rohr 20 aus Stahl. Gleiches gilt für das Gehäuse 9 der Gasfeder 8, wogegen die Hülse 23 aus einem weicheren Material, beispielsweise Zinkdruckguss, besteht.This tube, which forms a detachable part of the gas spring 8, is mounted in the usual manner axially displaceably in the guide tube 1, for which purpose this is provided in its upper region with a guide bush 25 made of a suitable plastic. In contrast, the guide tube 1 and the tube 20 are made of steel. The same applies to the housing 9 of the gas spring 8, whereas the sleeve 23 consists of a softer material, for example die-cast zinc.

Längenverstellungen der Gasfeder 8 und damit Höhenverstellungen der gesamten Hubvorrichtung erfolgen durch Betätigung eines aus dem oberen, der Kolbenstange 10 abgewandten Ende herausragenden Betätigungsstössels 26 der Gasfeder 8, der zur Ermöglichung der entsprechenden Längenverstellungen in das Gehäuse 9 hineingedrückt wird. Hierzu ist in dem sich konisch nach oben verjüngenden Befestigungsabschnitt 21 ein nach oben aus letzterem herausragender Schiebekörper 27 angeordnet, der mit einer Anlagefläche 28 gegen den Betätigungsstössei 26 anliegt. Dieser Schiebekörper 27 ist weiterhin mit Haltefingern 29 versehen, die federnd hinter einen entsprechenden Ring 30 an der Hülse 23 greifen, wodurch der Schiebekörper 27 gegen ein unbeabsichtigtes Herausfallen oder Herausziehen aus dem Befestigungsabschnitt 21 unter gleichzeitiger weitgehend spielfreier Anlage der Anlagefläche 28 gegen den Betätigungsstössel 26 gesichert ist. Zum Einschieben des Betätigungsstössels 26 in das Gehäuse 9 können die Haltefinger 29 des Schiebekörpers 27 selbstverständlich an der Innenfläche der Hülse 23 frei entlanggleiten. Die Betätigung erfolgt mittels eines in der Nabe 22 in üblicher Weise gelagerten schwenkbaren Betätigungshebels 35, der gegen eine axial verstellbare Aussenfläche 36 des Schiebekörpers 27 zur Anlage kommt. Diese Aussenfläche 36 wird durch den Kopf einer Schraube 31 gebildet, die in eine entsprechende koaxiale Ausnehmung 32 im Schiebekörper 27 hineingeschraubt ist. Die Schraube 31 und die Ausnehmung 32 sind so dimensioniert, dass die mit einem Holzschraubengewinde versehene Schraube 31 in dem Kunststoff des Schiebekörpers 27 selbsthemmend gehalten ist. Die Schraube 31 wird derart in den Schiebekörper 27 eingeschraubt, dass ihre Aussenfläche 36 spielfrei gegen den Betätigungshebel 35 anliegt, dass dieser also kein für einen Benutzer spürbares Spiel hat. Um die als Schlitz-oder Sechskantschraube ausgebildete Schraube in einfacher Weise in den Schiebekörper hinein-oder aus diesem herausdrehen zu können, ist der Schiebekörper 27 undrehbar in dem Befestigungsabschnitt 21 angeordnet. Hierzu ist ein oberer, an der Innenwand des Befestigungsabschnittes 21 anliegender hülsenartiger Führungsabschnitt 33 als Polygon-Querschnitt, beispielsweise als Acht-Kant-Querschnitt ausgebildet, wie aus Fig. 2 hervorgeht. Die Mantellinien dieses Führungsabschnittes 33 verlaufen parallel zueinander. Entsprechend ist die Innenwand des Befestigungsabschnittes 21 als acht-kantige Führungsfläche 34 ausgebildet, die so bemessen ist, dass der Führungsabschnitt 33 an ihr klemmungsfrei aber verdrehungsgesichert entlanggleiten kann. Die Führungsfläche 34 erstreckt sich also nach unten über den Führungsabschnitt 33 um das Mass hinaus, um das der Betätigungsstössel 26 in das Gehäuse 9 eingeschoben werden kann.Length adjustments of the gas spring 8 and thus height adjustments of the entire lifting device are carried out by actuating an actuating plunger 26 of the gas spring 8 which protrudes from the upper end facing away from the piston rod 10 and which is pressed into the housing 9 to enable the corresponding length adjustments. For this purpose, an upwardly protruding sliding body 27 is arranged in the fastening section 21, which tapers conically upwards and bears with a contact surface 28 against the actuating push piece 26. This sliding body 27 is further provided with retaining fingers 29 which engage resiliently behind a corresponding ring 30 on the sleeve 23, as a result of which the sliding body 27 is secured against the actuating plunger 26 against inadvertent falling out or pulling out of the fastening section 21 while at the same time the bearing surface 28 is largely free of play is. To insert the actuating plunger 26 into the housing 9, the holding fingers 29 of the sliding body 27 can of course slide freely along the inner surface of the sleeve 23. The actuation takes place by means of a pivotable actuation lever 35 which is mounted in the hub 22 in the usual way and which comes to bear against an axially adjustable outer surface 36 of the sliding body 27. This outer surface 36 is formed by the head of a screw 31 which is screwed into a corresponding coaxial recess 32 in the sliding body 27. The screw 31 and the recess 32 are dimensioned such that the screw 31 provided with a wood screw thread is held in the plastic of the sliding body 27 in a self-locking manner. The screw 31 is screwed into the sliding body 27 in such a way that its outer surface 36 lies against the actuating lever 35 without play, so that it does not have any play noticeable to a user. In order to be able to easily screw the screw designed as a slotted or hexagon screw into or out of the sliding body, the sliding body 27 is non-rotatably arranged in the fastening section 21. For this purpose, an upper sleeve-like guide section 33, which bears against the inner wall of the fastening section 21, is designed as a polygon cross section, for example as an octagonal cross section, as can be seen from FIG. 2. The surface lines of this guide section 33 run parallel to one another. Accordingly, the inner wall of the fastening section 21 is designed as an octagonal guide surface 34, which is dimensioned such that the guide section 33 can slide along it without jamming but secured against rotation. The guide surface 34 thus extends downward beyond the guide section 33 by the amount by which the actuating plunger 26 can be inserted into the housing 9.

Claims (4)

1. Longitudinally displaceable pneumatic spring for a lockable lifting device for the infinitely variable adjustment of seats, table tops or the like, with an at least predominantly cylindrical housing from one end of which project coaxially a piston rod (10) and from its other end coaxially an actuating push rod (26) for longitudinal adjustment purposes, with, extending the housing (9) coaxially and enclosing the actuating push rod (26), a fixing portion for attachment to a hub provided on the seat or on the table top and with, disposed for displacement in the fixing portion (21) and adapted to abut the actuating push rod (26), a sliding member (27) comprising an axially screw-adjustable outer surface for substantially clearance free abutment on an actuating lever (35), characterised in that the sliding member (27) is non-rotatably guided in the fixing portion (21), for which purpose the sliding member (27) has, bearing on a guide face (34) of the fixing portion (21), a guide portion (33) of non-circular cross-section.
2. Pneumatic spring according to Patent Claim 1, characterised in that the guide portion (33) and the guide face (34) have a polygonal cross-section.
3. Pneumatic spring according to one of Patent Claims 1 or 2, characterised in that guide portion (33) and guide face (34) are bounded by mutually parallel generatrices.
4. Pneumatic spring according to one of Patent Claims 1 to 3, particularly Patent Claim-3, characterised in that the sliding member (27) is axially outwardly fixed in its inoperative position.
EP84108989A 1983-07-29 1984-07-28 Lengthwise adjustable gas spring for a lockable lifting device for the infinitely variable positioning of seats, table tops or the like Expired EP0133523B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84108989T ATE33538T1 (en) 1983-07-29 1984-07-28 LENGTH-ADJUSTABLE GAS SPRING FOR A LOCKABLE LIFTING DEVICE FOR CONTINUOUS ADJUSTMENT OF SEATS, TABLE TOPS OR THE LIKE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19838321901U DE8321901U1 (en) 1983-07-29 1983-07-29 LENGTH ADJUSTABLE GAS SPRING FOR A LOCKABLE LIFTING DEVICE FOR CONTINUOUSLY ADJUSTING SEATS, TABLETOPS OR THE LIKE
DE8321901U 1983-07-29

Publications (3)

Publication Number Publication Date
EP0133523A2 EP0133523A2 (en) 1985-02-27
EP0133523A3 EP0133523A3 (en) 1986-04-02
EP0133523B1 true EP0133523B1 (en) 1988-04-20

Family

ID=6755672

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84108989A Expired EP0133523B1 (en) 1983-07-29 1984-07-28 Lengthwise adjustable gas spring for a lockable lifting device for the infinitely variable positioning of seats, table tops or the like

Country Status (6)

Country Link
EP (1) EP0133523B1 (en)
JP (1) JPS6054445U (en)
AT (1) ATE33538T1 (en)
BR (1) BR8403751A (en)
DE (2) DE8321901U1 (en)
ES (1) ES280728Y (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3420528A1 (en) * 1984-06-01 1985-12-05 Stabilus Gmbh, 5400 Koblenz CONTINUOUSLY ADJUSTABLE LIFTING DEVICE
US4886288A (en) * 1988-03-25 1989-12-12 Dysarz Edward D Device and method to safely elevate stabilize and lower a wheel chair
DE3836397A1 (en) * 1988-10-26 1990-05-03 Stabilus Gmbh LENGTH-ADJUSTABLE RELEASE PESTLE FOR A RELEASE MECHANISM OF GAS SPRINGS FOR THE HEIGHT ADJUSTMENT OF FURNITURE
SE467812B (en) * 1990-05-22 1992-09-21 Dorotea Specialkonstrukt STAND
DE4227553A1 (en) * 1992-08-20 1994-02-24 Stabilus Gmbh Height adjustable support esp. for chair seat - has foot, upright, guide surface, support in bottom of upright.
US5931536A (en) * 1997-10-16 1999-08-03 Wu; Yao-Chuan Adjustable armrest of a chair
US7017872B2 (en) 2003-10-20 2006-03-28 Attwood Corporation Height adjustable boat seat pedestal

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3790119A (en) * 1971-08-31 1974-02-05 F Bauer Energy storing device, particularly a blockable pneumatic spring
CH619604A5 (en) * 1977-08-25 1980-10-15 Fehlbaum & Co Apparatus for adjusting the seat height on a swivel chair

Also Published As

Publication number Publication date
EP0133523A2 (en) 1985-02-27
DE3470451D1 (en) 1988-05-26
ES280728Y (en) 1985-09-16
EP0133523A3 (en) 1986-04-02
JPH0132904Y2 (en) 1989-10-06
JPS6054445U (en) 1985-04-17
BR8403751A (en) 1985-07-02
ES280728U (en) 1985-02-16
ATE33538T1 (en) 1988-05-15
DE8321901U1 (en) 1985-01-10

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